nesting sites of horned puffins are rock crevices on cliffs. The Atlantic puffin burrow is usually lined with material such as grass, leaves, and feathers but is occasionally unlined. The eggs of the Atlantic puffin are typically creamy white but the occasional egg is tinged lilac.

Where rabbits breed, sometimes Atlantic puffins breed in rabbit burrows.

Puffins form long-term pair bonds or relationships. The female lays a single egg, and both parents incubate the egg and feed the chick (or "puffling").

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